If you need to use the uid instead of msgno use
imap_clearflag_full($stream, implode(',', $flags), '\\DELETED', ST_UID);
(PHP 4, PHP 5, PHP 7)
imap_undelete — Desmarcar el mensaje que está marcado para borrar
$imap_stream
, int $msg_number
[, int $flags
= 0
] ) : boolElimina la bandera de borrado de un mensaje especificado, que está establecida mediante imap_delete() o imap_mail_move().
Devuelve TRUE
en caso de éxito o FALSE
en caso de error.
If you need to use the uid instead of msgno use
imap_clearflag_full($stream, implode(',', $flags), '\\DELETED', ST_UID);
The imap_delete function allows the option to use a UID for the message number but the imap_undelete function does not.